Nut.



- STATES PATIENT MAX SCHUBERT ANDFOTTO REOHNITZ, OF OOTTBUS. GERMANY.

' i NUT. 7

Specification of Letters 1 atent.

Patented March 27, 1906.

To all whom itmay concern.-

Be it known that we, MAX SOHUBERT and OTTO REoHNITz, manufacturers, subjects of the German Emperor, residing at Cottbus, Germany, have invented certain new and useful Improvements in Nuts, of-which the following is a specification.

The subject of the present invention is a female screw or nut which not only offers the advantage of'fully accomplishing What two nuts (nut and lock-nut) are intended to do,

(but in reality do not accomplish,) but has also the very considerable advantage that the same can be screwed to any part of an iron core where a short thread has been out without tapering the ends of the bolt or providing them with threads. Even curves andangles offer no resistance, and, further, a much flatterthat is to say, less dee thread is suflicient,"wvhich, again, means less weakening of the core or bolt. Finally, this nut can be secured in anyplace by means of a set-screw which does not touch the thread; but not only with the aid of a set-screw, but in a far more simple and safe and automatic manner, can the nut be fastened as described shows a threaded conical tube cut in in the following. Finally, the manufacture is much cheaper than with the ordinary nut.

The drawings show a few sample constructions.

Figure-1 represents an iron core having only a thread in the middle, without ta ering or pared ends, with the new nut in a ongitudinal section. Fig. 2 shows a new nut in cross-section. Fig. 3 represents aniron core, the same as in Fig. 1, with a side view of the nut. Fig. 4 shows a longitudinal section of the nut with the set-screwf, which latter secures the thread-shells in the mantle. Fig. 5 at the ends alternately, but not out quite through. Fig. 6 shows a sample of a divided mantle which is stretched and held fast through the expansion of the thread-shells.

The cone or pyramid shaped thread-shells, which may be composed *of two or several parts 0 and e, are so formed that if they are placed against the threaded core a and the mantle b is passed over them. they must follow the rotation of the mantle, which isprobably best attained by the hexa' onal form nuts usually have. If the mantle of the nut touches against an abutment or a band, peg,

or another nut, the thread-shells must on a further rotation of the mantle enter the man-- tle, andthe lateral pressure is transmitted the thread-core.

vertically to the thread-core in consequence of the conical or wedge-shaped form of the thread-shells and in such a manner that all the surfaces of the thread are placed firmly and uniformly against each other and are therefore pressed together energetically.

In the ordinary nut with lock-nut the surfaces of the thread do not set at all against one side of the thread, and against the other only partially. Sometimes the opposite pointsonly of the thread touch each other, which then frequently on the nut being drawn tight are driven out of their lace, (get twisted and are screwed wrong.) in order to prevent this dan er of wrong screwing or overscrewing as muo as possible, threads had up to the present to be cut in very deep, which of course means a great weakening of With the new nut an overscrewing is impossible, even if the thread be as flat as can be imagined. The weakening of the thread-core is therefore reduced to a minimum. As the opening in the mantle of I it is possible to ass the former over curves,

angles, and ban les, as indicated by the dashline in Fig. 1.

If this new nut is to be screwed tight at I any point of the. thread, a temporary abutment is formed by a second nut. The nut to be fixed is screwed against this. The threadshells are then fixed by means of the set-screw f in the mantle, or the thread-shells fix themselves in consequence of having the conical contact and glidin surfaces slightlyroughened, whereby the ing of the thread-shells through the rather strong union with the mantle is attained in the highest degree, whereupon the abutment-nut is removed. The nut tightened in this way can only by violence be loosened or turned. This unconditional firmness of the new nut is, among others, of the greatest importance for the rails of railways. The divided mantle, Fig. 6, is excellently suited to allow of putting the nut between seats and places difficult to reach. The manufacture is I eatly simplified by the fact that the mant es and threadshells-can be pressed over suitable core-bars without the extra operation of cutting the threads in. y

What we claim as our invention, and desire to secure by United States Letters Patent, is I 1. A nut formed by a mantle in the shape of a nut with shells or plates provided with.

IIO

threads placed inside of this mantle, the confast, substantially as and for the purpose set ical parts of said thread being fixed bya setforth.

screw in the mantle of the nut, substantially In testimony whereof we have signed our as set forth. names to this specification in the presence of 5 2. A nut formed by a mantle in the shape two subscribing witnesses.

of a nut with shells or plates provided with MAX SCHUBERT.

threads, placed inside of this mantle, said OTTO RECHNITZ.

mantle being divided and so constructed Witnesses:

that it is adapted to be stretched by the ex- WOLDEMAR HAUPT IO pansion of the thread-shells and thus held HENRY HAsPER. 

